POV-Ray : Newsgroups : povray.beta-test : Media problems. : Re: Media problems. Server Time
28 Jul 2024 14:24:24 EDT (-0400)
  Re: Media problems.  
From: Alain
Date: 8 Sep 2008 14:17:24
Message: <48c56c34@news.povray.org>
Jim Holsenback nous illumina en ce 2008-09-08 06:44 -->
> "Stephen" <mcavoysAT@aolDOTcom> wrote in message 
> news:1818c45uba5iv8h06oemp4qfa9akher6jd@4ax.com...
>> When using a media with settings of:
>>      confidence 0.0
>>      variance   1.0
> 
> After reading this passage in help about these settings I'm confused:
> As each interval is sampled, the variance is computed. If the variance is 
> below a threshold value, then no more samples are needed. The variance and 
> confidence keywords specify the permitted variance allowed and the 
> confidence that you are within that variance. The exact calculations are 
> quite complex and involve chi-squared tests and other statistical principles 
> too messy to describe here. The default values are variance 1.0/128 and 
> confidence 0.9. For slower more accurate results, decrease the variance and 
> increase the confidence.
> 
> Why would there ever be a condition where you would use confidence 0.0? 
> You're saying NO confidence in the media sample. Am I missing something 
> here?
> 
> Jim
> 
> 
You may use a small confidence value for some quick test renders.
You may do an animation varying that value to see it's effect.
You may have set it to zero by error.

-- 
Alain
-------------------------------------------------
At the feast of ego everyone leaves hungry.
	Bentley's House of Coffee and Tea, Tucson, AZ


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